hallander



E. E. HALLANDER SPRING-APPLIED ELECTROMAGNETIC RELEASED BRAKE May 1, 1951 4 Sheets-Sheet 1 Original Filed Jan. 14, 1949 4 Sheets-Sheet 2 Original Filed Jan. 14, 1949 E D N m Ww L M mi. n; ,Ev. .M NIB 2 v 1 w Q E. E. HALLANDER SPRING-APPLIED ELECTROMAGNETIC RELEASED BRAKE May 1, 1951 4 Sheets-Sheet 3 Original Filed Jan. 14, 1949 EL VIN E. H HL LHNDER.

W a7?1f% May 1, 1951 E. E. HALLANDER SPRING-APPLIED ELECTROMAGNETIC RELEASED BRAKE 4 Sheets-Sheet 4' Original Filed Jan. 14, 1949 Reissued May 1, 1951 SPRING-APPLIED ELECTROMAGNETIC RELEASED BRAKE Elvin E. Hallander, La Crosse, Wis., assignor, by mesne assignments, to Miehle Printing Press and Manufacturing Company, Chicago, 111., a

corporation of Delaware Original No. 2,512,565, dated June 20, 1950, Serial No. 70,840, January 14, 1949.

Application for reissue March 10, 1951, Serial No. 214,895

3 Claims.

Matter enclosed in heavy brackets I: 1 appears in the original patent but forms no part of this reissue specification; matter printed in itali s indicates the additions made by reissue.

This invention relates to braking equipment of the type wherein the brake is automatically set or applied as by spring pressure, and is electromagnetically released. More particularly, the invention contemplates brakes which include one or more friction elements, such as disks or rings, certain of which are mounted on a rotating element to be braked and others of which are mounted on a stationary support, such as the frame of a machine of which said rotating element is a part, in combination with electromagnetic means of the solenoid type including a solenoid, winding or coil having a fixed core, and an armature therefor, one of which is mounted on the frame of the machine while the other is operatively connected to said friction elements, said armature being normally held in spaced relation to said core of the solenoid and said friction elements being held in frictional contact with predetermined pressure by spring mechanism to set or apply the brake and hold said electrically driven part at rest, and said armature being attracted to said core and causing actuation of said friction elements out of contact with each other uponenergization of said solenoids. The invention has special use in brake motors where said rotating element is the shaft of an electric motor and said solenoids are energized automatically upon the supply of current to the motor for starting the same.

A prime object of the invention is to provide a brake motor of this character which shall include novel and improved means for manually releasing the brake, that is, for manually causing actuation of said friction elements out of contact with each other, whereby the brake may be manually released but at the same time adequate space or air gap between the armatures and the cores of the electromagnets shall be ensured to permit subsequent automatic resetting of the brake, that is, actuation of the friction elements into contact with each other.

In many known brake motors, the brake mechanism is so mounted with respect to the motor that accidental blows against or jars of the brake mechanism may throw the latter out of adjustment; and therefore another object of my invention is to provide a novel and improved construction, combination and arrangement of an electric motor frame or housing and brake mechanism for the motor, whereby the possibility of dislocation of or disturbance of normal relation between the friction elements on the motor shaft and the other friction elements, shall be reduced to the minimum.

A further object is to provide braking equipment of the character described which can be applied to and removed from the frame of an electric motor or other machine as a unit, whereby the installation, adjustment, and repair of the brake mechanism can be effected easily and quickly.

Other objects of the invention are to provide a novel and improved construction, combination and arrangement of the friction elements, the armatures and the cores of the electromagnets, whereby even seating of the armature on the cores of the magnets can be ensured with consequent smooth operation and a minimum -of chatter or vibration of the parts; and to obtain other advantages and results that will be brought out by the following description in conjunction with the accompanying drawings, in which Figure 1 is a central vertical longitudinal sectional view through a brake motor including braking equipment constructed in accordance with the invention; r Figure 2 is a fragmentary longitudinal sectional view, approximately on the plane of the line 2-2 of Figure 3;

Figure 3 is a transverse vertical sectional view.

. approximately on the plane of the line 3-3 0 Figure l; I

Figures 4, 5 and 6 are transverse vertical sectional views, approximately on the planes of the respective lines 44, 55 and B6 of Figure 1;

Figure 7 is a similar view, approximately on the plane of the line l-'l of Figure 1; 1

Figure 8 is an enlarged fragmentary detached side elevational view of the actuating shaft of the manual release mechanism, and

Figure 9 is an end elevational view thereof.

Specifically describing the invention, the reference character A designates the rotating part to be braked, which in the present instance is the shaft of an electric motor which includes a housing B having an end cover 0 in which is one bearing D for the shaft A, the other bearing E for which is mounted in an adaptor ring I which serves both as an end cover for the motor housing B and as a mount for the brake mechanism. The adaptor ring I may be secured to the motor housing in any suitable manner, as by means of cap screws 2, and the ring preferably has circumferentially spaced openings 3 therein which with similarly spaced openings 4 in the end cover C provide ventilation for the armature F and field windings G of the motor.

Concentric with and secured to the end of the sassmounting ring i opposite the motor bya'ny suitable means such as cap screws isa support cage H for certain parts of the brake unit. As

shown, this cage comprises a base ring 6 which is whicli is keyed erotherwis fastened on the shaft to rotate therewith. At; one side of one of the friction disks is a thrust resisting friction plate I2 that is mounted on support rods l3 each of whichhas one end secured in the adaptor ring I, as. by a screw threaded connection l4, and its other end extends through an opening I5 in the end. plate I, lock nuts l6 preferably being threaded on the rods to permit. rotation and longitudinal adjustment of the rods relatively to they mounting plate and the base plate and to lock them in adjusted position. Each of the rods H- has. a shoulder or collar l1 against which the thrustresisting plate l2 abuts.

Atthe other side of said brake disk 9: opposite thegthrust-resisting plate I2 is a floating friction plate I8 that is slidably mounted at H! on the rods 13 so as to be free for movement transversely of itself and longitudinally of the rods. At its, opposite sides, the friction plate [8 has layers of, suitable friction material 28 secured thereon, and the plate l2 has a similar layer of friction, ma-' terial 2| to frictionally cooperate with the ad-v jacent brake disk 9.

'Ifheother brake disk 9 is disposed between the friction plate 18 and a presser plate 22 which has a layer of friction material 23 to frictionally co-. operate with the brake disk; The presser plate 22 is also slidably mounted on the support rods i3. and compression springs 24 are interposed be' tween said presser; plate and an, adjustable nut 25 each of the studs; I H 1 With this construction, it will be observed that the springs 2-4 will normally press the juxtaposed friction elements of the brake into frictionalcontact with each other, the pressure depending-upon theforce exerted by the springs, 2.4 which can be Therefore, normally the adjusted by the nuts 25. brake is automatically applied and the shaft A is held against rotation,

For automatically releasing the brake, a. plu r rality of electromagnets are provided; and; preferably these magnets are energized automatically upon supply of electricity to the motor for starting the same; As shown, there are four of these;

magnets, each comprising a laminated core 26 secured on the inner side of the end plate of the cage by any suitable means, such as screws 21, each core being.- surrounded by a coil or, winding 28 which may beconnected in the motor circuit.

in lgnown manner to accomplish the above doscribed purpose. G'ooperating-with each of the cores 28 is an armature 29 which is rigidly mounted on the presser plate V The juxtaposed ends of the cores and, armatures: are preferably flat and in a common plane, perpendicular to the axisof-the shaft A and approximately parallel.

to the planes of the, frlctionarelements 9; I 2, i8,- 2 2; a n d normally, the armatures are spaced from side of the plate 37,

the cores a substantial distance as best shown in Figure I," where the spaces are designated 38 and provide air gaps between the cores and armatures. Upon energization of the windings 28, the armatures are magnetically attracted to the cores against the influence of the springs 24 so as to release the brake and permit free rotation of the motor shaft A; and when the windings 28 are deenerg iz'ed; the springs 24 automatically apply the brake by forcing the friction elements into frictional engagement with each other so as to stop the rotation of the motor shaft.

Another feature of my invention is means for manually releasing and holding the brake in released position and at the same time leaving a space between the cores and the armatures to permit the brake to be automatically electromagnetically applied. As shown, this manualre leasing means comprises an actuating shaft 3| which is rotatably mounted in an opening 32 in the end plate I of the cage H, ,coaxially with the friction elements, said shaft having a diametrical slot 31a opening through its inner end and also having at least one cam finger 33 at one side of said slot to cooperate with a stud 34 that is mounted in a tubular hub 35 on the presser plate 22 Two fingers are shown to permit use of two studs, if desired. The actuating shaft 3| is rotatable but, has limited longitudinal movement in the, end plate, 1, and as shown, the shaft has ashoiilder 38 disposed at one side of a plate 31 that is secured to the outer side of the end plate 1 andthrough which the shaft 3| projects, and said shaft has a nut 38; thereon. at the opposite said nutbei'ng locked in ad justed position in any suitable manner as by set screws 3 9.

When the brake is in normal or applied con dition, the, stud 34 is disposed in the slot ila and in the path. of rotation of the inclined or cam surface 40' of one of the cam fingers 3.3, so that uponv rotation or theactuating shaft iii in one direction, the pin. will be engaged by said cam surface 48 of one ofthe fingers 33 and pulled toward the outer end of said actuating shaft so as to draw the presses plate 22 away from the other friction elements, and this operation will continue until the pin becomes seated in a notch 4| in said carhfingr, whereupon the presser plate tion and return rotation of the'shaft 3| will be prevented by the frictional contactv between the pin 3 land the cam fihgf 33 causedby the s rin s For manuauyrotatifig the shaft 3| i have provided a finger-piece, or lever 42, and preferably a spring 43 is provided fol rotatin the shaft into normal pc'lsitiorl, such rotation being limited by abutment of the slot side or stud, AS, Shown, this sprin is spiral in shape. and has one e'fid connected to the s aft 3 l, as at 44, and its other end oiiflted t0 the end plate I of the cage, as indioated'at 45.

Thecafri fingers 33. are of such shape and propbrtibhs that when the brake is in manually released position, as shown inFigure l, the armabe returned to its: neutral position-by. the spring the filiger with the 5 43. Thus, the brake is held automatically and electromagnetically so that when the electric current is next cut off from the windings 2B, for example, upon stopping of the motor, the brake will be automatically applied by the springs 24.

Preferably, a cover 45 is applied over the moving parts of the brake mechanism, and as shown, said cover telescopically engages the base ring 6 of the cage H and is secured to the end plate 1 by cap screws 41.

It will be seen by those skilled in the art that the brake mechanism can be easily and quickly mounted on the motor housing as a unit and in properly adjusted condition, and that the parts of the brake will be rigidly held in proper adjusted relation to the shaft A., The mounting of the friction elements l2, l8 and 22 on the rods l3 and the secure rigid mounting of the rods l3 at both ends in theadaptor ring I and the end plate I of the cageH, respectively, reduce to the minimum the possibility of disturbance of the adjustment of the brake by blows against or jars of the brake mechanism.

While I have shown and described the invention as embodied injcertain details of construction, it should be understood that this is primarily for the purpose of illustrating the principles of the invention and that many modifications and changes can be made in the construction of the brake mechanism and motor within the spirit and scope of the invention.

Having thus described the invention, What I claim is:

1. In combination with a machine housing and a rotary shaft journaled therein and projecting from one end thereof,a brake disk on said shaft to rotate therewith, friction plates at opposite sides of said brake disk, spring mechanism for normally actuatingl at least one of said plates in one direction toward the other to clamp said brake disk between said plates and thereby apply the brake, electromagnetic means including a coil for actuating said one of said plates in the opposite direction to release said brake disk, manually operable means for actuating said plate in the second-mentioned direction to release said brake disk independently of said electromagnetic means, means for .holding said friction plate in said position to release said brake disk, and means for causing release of said friction plate from said holding means automatically upon energization of said coil to permit automatic clamping of said brake disk upon subsequent deenergization of said coil to apply the brake 2. In a combination as defined in claim 1, said electromagnetic means comprising at least one core having a coil thereon and an armature to be electromagnetically drawn toward said core upon energization of said coil, one of said core and said armature being mounted on said friction plate and the other being mounted on a fixed support and normally disposed with an air gap between them, and said manually operable means and said disk upon subsequent deenergization of said coil to apply the brake].

3. In a combination as defined in claim 2, said manually operable means including a movable part movable in one direction upon operation of said manually operable means, [the addition of means for holding said friction plate in said position to release said brake disk, means for causing release of said friction plate from said holding means automatically upon energization of said coil to permit automatic clamping of said brake disk upon subsequent deenergization of said coil to apply the brake,] said holding means including a stud on said friction plate and a notch in said movable part in contact with one side of which said stud is held by force applied to said friction plate by said spring mechanism, and the last-named means including a spring for actuating said movable part in the other direction, whereby upon energization of said coil after manual release of said brake disk said stud will be moved out of contact with said movable part and the latter will be moved relatively to said stud to permit movement of said friction plate in the direction to clamp said brake disk upon deenergization of said coil.

ELVIN E. HALLANDER.

REFERENCES CITED The following references are of recordin the file of this patent or the original patent:

UNITED STATES PATENTS Number Name Date 1,154,791 Marr Sept. 28, 1915 2,059,028 Price Oct. 27, 1936 2,121,889 Sousedik June 28, 1938 FOREIGN PATENTS Number Country Date 456,678 Great Britain Nov. 13, 1936 

